Flat valve



Nov. 16 1926. 1,606,823

L. C. BAYLES FLAT VALVE Filed August 1925 INVENTOR. Leia/1317,80 lean Federated Nov. is, was.

urrso STATES;

'lC E i LEWIS C. BAYLES, 0F EAS'I'OH, PENNSYLVANIA, ASSIGHOR T0 INGERSOLL-RAND 663i- PANY, OF JERSEY CITY, NEW JERSEY, A CORPQBA'EION OF NEW JERSEY;

FLAT VALVE.

Application filed August 26, 19%. serial No. 53,526..

This invention relates to pressure fluid rock drills, but more particularly to an 1mproved plate valve having a circumferential ,v

fin outside of the port area, whereby the'un balancing of the valve can be insured and the speed of its-action increased.

One of the objects of the. invention is to provide for a plate valve of the oscillating type in which a greater area subject toreduced pressure can be obtained alternately at'each end of the valve without the use of a shifting fulcrum. I

Further objects of the invention will hereinafter appear, and the invention is illustrated in one of its preferred forms'in the accompanying drawings, in which Figure 1 is a longitudinal sectional elevation partly broken away'of so much of a rock drill as will servetomake the invention clear r p I Figure 2 is a transverse sectional view on the line 2-2 of Figure 1 looking upwardly in the direction of the arrows, and

Figure 3 is a detailed transverse sectional view through the valve showing the cut away or relieved portions of the. circumference referred to as fins'in this application.

Referring to the drawin s, thecyli'nder A is provided with a piston having the f orward extension or shank C extending throu h the front 0 linder washer D. The cylincfier is rovide with an exhaust port E controlle by the piston and locate m the drawing centrally of the cylinder. The

valve F is arranged in the valve chamber G in the head block H, and between the valve y or outer side irom and the cylinder is located the cylinder head plate J havin the inlet port K leading directl to the ack end of the cylinder an the inlet port I passage 0 in the cylinder leadin to the inlet ,ort P at the forward end of t e cylinder. he valve F, for convenience of illustration, isshown in the form of a thin circular disk uniforml tapering on its upper e median line or d1ameter Q, to the peripheries S and E at each end. For convenience in explanation the two ends of the valve will be referredto by the letters desiting their peripheries, as the end S and 1 en R. The under or opposite side'of the valve 3 provided with a fulcrum T' irom which point there is a substantially umform taper in opposite directions as far as the periph- L communicating. with the.

eliminate the need of a shifting fulcrum in order to secure quick and positive valve action. Each functions alternately with the other, as the wing of the valve opposite to it starts to close under reduced pressure beneath it, and its purpose is to hastentheclosing by reducing the opposition which. in thisc'ase, is the area of the other'Wingbf the valve which is subjectto live pressure.

The fin causes a substantiaLportion ofthis area to be subjected to balanced pressure,

.whereas without the use of the undercut portion the whole .halfof the; wing to be opened would be "subjec'tedto' live pressure bearing down upon it; as will be more fully described later in the s ecification. The

valve chamber G in the eadblock H is circular in form and suflicient clearance is provided between the valve and the walls of .the chamber to valve. The valve may be guided in any suitable permit free oscillation-of the manner as by means of the pins U extending into sockets V in the valve with suflicient clearance to permit freedom of movement of the valve.

The back head W of the rock drill is rovided with the throttle valve X control ing the supply of live pressure fluid to the valve chamber G.

In theoperation of the device let it be assumed that the iston is at the end of its forward stroke an travelling rearwardly as indicated in Figure 1. The live pressure fluid in the valve chamber G holds the valve in the position indicated and live ressure fluid is admitted over the periphery of the valve to the inlet port Pat the forward end of the cylinder to drive the piston rearwardl After the piston closes the exhaust port 2 compression in the rearward end of the cylinder is built up to act upon the inner face of the valve at the closed end S through the port K}. At the same time the fin e at the closed and S of the valve is subject to balanced pressure; bein acted upon on both sides by, hve, pressure id at line pressure.

When the piston B overruns and again opens the exhaust port E- to the forward end of the cylinder, the pressure is reduced or dropped beneath the end R of the valve over the entire surface from the fulcrum to the periphery R, including the fin f. This drop in pressure tends to'pull down the end B of the valve and thereby throw the valve, and is counteracted only by the live pressure on the top of the end S. This pressure is not applied to the entire surface, however, as the fin 6, being under cutas shown, is subject to a balanced pressure. Hence the valve F is placed in an unbalanced condition, the reduced pressure of end B acting on a greater area than the live pressure acting on the end S, the difierence being the area of the fin e or f At the same time pressure fluid trapped in the head of the cylinder by the upward stroke of piston B acts upon the under side-of the end S of the valve F through the port K and will tend to force the end S up and close the end B. Thus,'as a result of these three conditions occurring simultaneously," the valve isoscillated or thrown with great speed and positiveness, and pressure fluid is admitted into the rear end of the c linder through port K, forcing piston B ownwardly and causing repetition of the valve action.

I am not to be understood as limiting the cut extensions or Leoasaa ing a cylinder and a reciprocating piston, a

valve chamber having ports communicating with opposite endsvof the cylinder, and a fluid actuated distributing valve having wings a-daptedto cooperate with the-said inlet ports, said win having reducedunderns at o posite ends outside of the areas of the sai ports.

2. A fluid actuated rock drill comprising a cylinder and a reciprocating piston, a valve chamber adjoining said 0 linder having ports leading to opposite en s of said cylindcr for the distribution of motive fluid thereto, an oscillating distributin valvehaving two wings adapted to contro? the admission of pressure fluid to the cylinder through the said ports and reduced undercut portions on the said wings integral therewith and located oppositely to each other and outside of the areas of the said ports.

In testimony whereof I have signed this specification. v

' LEWIS. BAYLEfi. 

